batgrbproduct analysis for trigger=770981
batgrbproduct Analysis for Trigger=770981
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Thu Sep 7 03:51:55 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger770981/GCN5_download_cron
======================================================================
Trigger: 00770981 Segment: 000
BAT Trigger Time: 526375597.248 [s; MET]
Trigger Stop: 526375598.272 [s; MET]
UTC: 2017-09-06T07:26:17.605220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 128.703619534125 Dec: 70.7817005714058 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.09
Image Trigger?: NO
Rate S/N Ratio: 21.1187120819429 [ if not an image trigger ]
Image S/N Ratio: 11.09
Flight Position: [ source = BAT ]
RA: 128.703619534125 Dec: 70.7817005714058 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 128.670458724184 Dec: 70.8037676703287 [deg; J2000]
{ 08h 34m 40.9s , +70d 48' 13.6" }
+/- 0.74492933687611 [arcmin] (estimated 90% radius based on SNR)
+/- 0.214111723079694 [arcmin] (formal 1-sigma fit error)
SNR: 46.3245410832481
Angular difference between Flight and Ground position is 1.476991 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 47.8599999547005 +/- 4.85426867023946
Measured from: -25.7799999117851
to: 22.0800000429153 [s; relative to TRIGTIME]
T50: 12.6199999451637 +/- 0.98641167503302
Measured from: -3.27599990367889
to: 9.34400004148483 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.17599999904633
to: 7.17599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -35.2080000042915
to: 39.2239999771118 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.627259 5.070861 3.897248 0.874447
0.107754 0.115215 0.101063 0.078567 [error]
Peak 0.143929 0.287128 0.324980 0.096614
0.016098 0.018426 0.018811 0.013175 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.45e-06 2.40e-06 3.02e-06 7.57e-06 8.99e-06 1.44e-05 erg/cm2
Error 7.87e-08 7.66e-08 1.05e-07 5.84e-07 2.59e-07 6.45e-07 erg/cm2
Peak flux Power-law 1.84e+00 2.27e+00 2.03e+00 3.14e+00 7.23e+00 9.28e+00 ph/cm2/s
Error 2.34e-01 1.81e-01 1.44e-01 4.55e-01 4.97e-01 6.27e-01 ph/cm2/s
Fluence Cutoff-PL 1.33e-06 2.46e-06 3.12e-06 4.87e-06 8.81e-06 1.18e-05 erg/cm2
Error 1.02e-07 8.41e-08 1.21e-07 1.20e-06 2.81e-07 1.23e-06 erg/cm2
Peak flux Cutoff-PL 1.49e+00 2.37e+00 2.25e+00 1.66e+00 7.05e+00 7.77e+00 ph/cm2/s
Error 2.90e-01 2.04e-01 1.93e-01 5.90e-01 5.07e-01 7.75e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.54e+00 2.35e+00 2.23e+00 1.85e+00 7.09e+00 7.99e+00 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.669 0.051 - - 1.30e-02 3.65e-04 56.850 57
CPL 1.303 0.216 104.6 42.7 1.92e-02 4.34e-03 47.860 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.160 0.106 - - 6.19e-02 4.08e-03 62.980 57
CPL 0.358 0.488 118.9 52.3 1.41e-01 7.18e-02 53.440 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 43.200000 sec.
T50 in the 50-300 keV band: 11.328000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 74.432 -35.208 39.224
T90 47.860 -25.780 22.080
T50 12.620 -3.276 9.344
Peak 1.000 6.176 7.176
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
128.6705 +70.8038 0.0041 45.4 -30.7 13.8120 46.3 TRIG_00770981
------------------------------------------
Foreground time interval of the image:
-35.208 39.224 (delta_t = 74.432 [sec])
Background time interval of the image:
-239.248 -35.208 (delta_t = 204.040 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -35.208 sec. to 39.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66940 ( -0.0513694 0.0515142 )
Norm@50keV : 1.30075E-02 ( -0.000365306 0.000365258 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.85 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 57 degrees of freedom
# Null hypothesis probability = 4.807662e-01
Photon flux (15-150 keV) in 74.43 sec: 1.70948 ( -0.0545707 0.054783 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.98735e-06 ( -2.58687e-07 2.58868e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.208 sec. to 39.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30335 ( -0.221395 0.211361 )
Epeak [keV] : 104.585 ( -20.2012 65.1927 )
Norm@50keV : 1.91582E-02 ( -0.00375201 0.00491834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8546 for 56 degrees of freedom
# Null hypothesis probability = 7.722165e-01
Photon flux (15-150 keV) in 74.43 sec: 1.66249 ( -0.05988 0.06024 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8073e-06 ( -2.81494e-07 2.80229e-07 ) ergs/cm2
Band function
Time interval is from -35.208 sec. to 39.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30197 ( -0.211469 0.60567 )
beta : -2.13794 ( 2.14976 0.405693 )
Epeak [keV] : 103.859 ( -50.0468 64.9313 )
Norm@50keV : 1.92066E-02 ( -0.00391824 0.026514 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.85 using 59 PHA bins.
# Reduced chi-squared = 0.8700 for 55 degrees of freedom
# Null hypothesis probability = 7.420037e-01
Photon flux (15-150 keV) in 74.43 sec: 1.66150 ( 5.3385 -0.06102 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6893 ( )
R^2/D10^2 : 0.154060 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 302.73 using 59 PHA bins.
# Reduced chi-squared = 5.3110 for 57 degrees of freedom
# Null hypothesis probability = 3.482281e-35
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.861e-07 3.468e-08
25- 50 2.425e-06 9.267e-08
50-150 4.140e-06 2.114e-07
15-150 7.150e-06 2.270e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 162.605 (-20.5986 26.2105)
Norm : 6.93514 (-0.246685 0.261512)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.95 using 59 PHA bins.
# Reduced chi-squared = 0.8412 for 57 degrees of freedom
# Null hypothesis probability = 7.978656e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.305e-06 7.331e-08
25- 50 2.449e-06 1.470e-07
50-150 5.006e-06 1.167e-06
15-150 8.760e-06 1.256e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.18128 (-0.785204 0.842393)
R1^2/D10^2 : 1.61007 (-0.505916 0.833325)
kT2 [keV] : 24.9925 (-2.19787 2.86414)
R2^2/D10^2 : 2.23303E-02 (-0.00769414 0.00985203)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.97 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.381100e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.199e-06 1.213e-07
25- 50 2.488e-06 1.526e-07
50-150 5.005e-06 3.614e-07
15-150 8.693e-06 5.210e-07
Peak spectrum fit
Power-law model
Time interval is from 6.176 sec. to 7.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16020 ( -0.106425 0.105384 )
Norm@50keV : 6.18768E-02 ( -0.00408391 0.00408006 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.98 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.731060e-01
Photon flux (15-150 keV) in 1 sec: 7.22505 ( -0.496827 0.497689 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.35047e-07 ( -4.40326e-08 4.41044e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.176 sec. to 7.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.358198 ( -0.515866 0.459844 )
Epeak [keV] : 118.864 ( -25.5559 79.011 )
Norm@50keV : 0.140595 ( -0.0516241 0.0919554 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9543 for 56 degrees of freedom
# Null hypothesis probability = 5.722868e-01
Photon flux (15-150 keV) in 1 sec: 7.04608 ( -0.50666 0.50755 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23032e-07 ( -4.5851e-08 4.5656e-08 ) ergs/cm2
Band function
Time interval is from 6.176 sec. to 7.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.358128 ( -0.418623 0.503024 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 118.843 ( -16.6711 78.8291 )
Norm@50keV : 0.140607 ( -0.0516111 0.0920341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9717 for 55 degrees of freedom
# Null hypothesis probability = 5.343462e-01
Photon flux (15-150 keV) in 1 sec: 7.08955 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.4184 (-1.53325 1.69964)
R^2/D10^2 : 0.329165 (-0.0769596 0.0976395)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.48 using 59 PHA bins.
# Reduced chi-squared = 1.359 for 57 degrees of freedom
# Null hypothesis probability = 3.689236e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.623e-08 3.305e-09
25- 50 1.325e-07 1.235e-08
50-150 4.105e-07 3.980e-08
15-150 5.692e-07 4.440e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-10.6262 -200)
Norm : 30.3612 (-2.04386 2.04386)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.36 using 59 PHA bins.
# Reduced chi-squared = 1.708 for 57 degrees of freedom
# Null hypothesis probability = 6.940092e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.562e-08 6.230e-09
25- 50 1.455e-07 1.265e-08
50-150 3.190e-07 8.350e-08
15-150 5.401e-07 9.115e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.58206 (-2.87871 3.79151)
R1^2/D10^2 : 2.42821 (-1.47379 6.28746)
kT2 [keV] : 28.2664 (-4.85662 11.6118)
R2^2/D10^2 : 9.30789E-02 (-0.0671179 0.0966745)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9716 for 55 degrees of freedom
# Null hypothesis probability = 5.345975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.596e-08 2.007e-08
25- 50 1.393e-07 4.912e-08
50-150 4.399e-07 1.380e-07
15-150 6.252e-07 1.969e-07
Plot creation:
Thu Sep 7 04:28:14 EDT 2017